Screen black, won't sleep, but iBook seems to be on

I haven't quite been able to find an answer to my problem on the discussion groups yet.
Two nights ago, my girlfriend was using our 900mhz G3 iBook (dual USB) running 10.3.9. She was surfing the internet and closed the screen to put it to sleep. When she went to wake it up, the screen was black and not resonding. When I got home, I could hear the fan working and the caps lock light went on when I pressed it in. If you held down the power button it seemed to power down when you turned it off and would make the power up/on sound when you turned it on. However, if you closed the lid, the sleep light would not come on.
Yesterday, I did some reading and decided to do a PMU reset when I got home. I forgot to look up how to reset the PRAM and didn't do it. Before doing the PMU reset, I took out the battery and disconnected the iBook from the power for at least a minute. Then, I reset the PMU and the computer magically came back to life without any problems.
I immediately restarted with the hardware test CD and it came up again no problem. I started the hardward tests and it made it through to memory. The Logic Board and other hardware tested fine. But when it was in the middle of testing the RAM, a weird blobby rainbowey green/purple/white/black sort of blob started moving up and down the sceen and then eventually froze as one big color changing blob.
I did a forced restart and the screen never really came back. The computer still seems to be on (the volume button works and it sounds like it's on). However, the screen is totally black. And resetting the PMU again has not worked at all.
Any thoughts?

This seems similar to the problem that I had just a few days ago. I was typing as paper and the screen just flipped out and the computer froze. I had to do a hard shutdown and then zapped the pram and the PMU. The computer was clearly "on" but the screen was black. I took it to the apple sote and they sent it out for repair. It was the logic board that failed on mine(the logic board is a known issue and has an extended coverage on it. check this link (http://www.apple.com/support/ibook/faq/)) That being said it is odd that when you were able to run the hardware test, the logic board was ok. My mother in law had a very similar problem to mine except when she plugged in an external monitor she could see the desktop etc. When she took hers in for her issue it was something different and not covered by the apple extended protection. Do you have an external monitor to test with?
With all of that being said your absolute best bet is to take it to apple. They will most likely have to send it to a tech center. I told them that if it was anything other than the logic board I wanted to be notified to authorize the repairs so I didn't come back with a huge bill.

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